The right answer is Nucleus.
The nucleus is the main site of DNA synthesis (during replication for cell division) and RNA (for transcription).
The lysosome has a cellular garbage function, where the non-functional molecules are removed by digestion.
The granular endoplasmic reticulum is the place of synthesis (in the associated ribosomes) of the proteins secreted outside the cell and of the proteins and lipids constituting the membranes of the cellular organelles. Golgi, lysosomes, mitochondria, nucleus, ribosomes, vesicles ...). It participates in the correct folding of the proteins that have just been synthesized.
The smooth endoplasmic reticulum participates in cellular metabolism, synthesizing lipids and storing calcium.
The Golgi apparatus is an organelle of eukaryotic cells. It is a major site for the transfer and sorting of molecules, as well as the synthesis of glycoproteins and sphingolipids.
